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gimp/plug-ins/common/emboss.c

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/**************************************************
* file: emboss/emboss.c
*
* Copyright (c) 1997 Eric L. Hernes (erich@rrnet.com)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. The name of the author may not be used to endorse or promote products
* derived from this software withough specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id$
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include <sys/types.h>
#include <libgimp/gimp.h>
#include <gtk/gtk.h>
#include <plug-ins/megawidget/megawidget.h>
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif /* M_PI */
static mw_preview_t emboss_do_preview;
struct Grgb {
guint8 red;
guint8 green;
guint8 blue;
};
struct GRegion {
gint32 x;
gint32 y;
gint32 width;
gint32 height;
};
struct piArgs {
gint32 img;
gint32 drw;
gdouble azimuth;
gdouble elevation;
gint32 depth;
gint32 embossp;
};
struct embossFilter {
gdouble Lx;
gdouble Ly;
gdouble Lz;
gdouble Nz;
gdouble Nz2;
gdouble NzLz;
gdouble bg;
} Filter;
static void query(void);
static void run(gchar *name, gint nparam, GParam *param,
gint *nretvals, GParam **retvals);
int pluginCore(struct piArgs *argp);
int pluginCoreIA(struct piArgs *argp);
static inline void EmbossInit(gdouble azimuth, gdouble elevation,
gushort width45);
static inline void EmbossRow(guchar *src, guchar *texture, guchar *dst,
guint xSize, guint bypp, gint alpha);
#define DtoR(d) ((d)*(M_PI/(gdouble)180))
GPlugInInfo PLUG_IN_INFO = {
NULL, /* init */
NULL, /* quit */
query, /* query */
run, /* run */
};
static struct mwPreview *thePreview;
MAIN()
static void
query(void){
static GParamDef args[] = {
{ PARAM_INT32, "run_mode", "Interactive, non-interactive" },
{ PARAM_IMAGE, "img", "The Image" },
{ PARAM_DRAWABLE, "drw", "The Drawable" },
{ PARAM_FLOAT, "azimuth", "The Light Angle (degrees)" },
{ PARAM_FLOAT, "elevation", "The Elevation Angle (degrees)" },
{ PARAM_INT32, "depth", "The Filter Width" },
{ PARAM_INT32, "embossp", "Emboss or Bumpmap" },
};
static gint nargs = sizeof (args) / sizeof (args[0]);
static GParamDef *rets = NULL;
static gint nrets = 0;
gimp_install_procedure("plug_in_emboss",
"Emboss filter",
"Emboss or Bumpmap the given drawable, specifying the angle and elevation for the light source.",
"Eric L. Hernes, John Schlag",
"Eric L. Hernes",
"1997",
"<Image>/Filters/Distorts/Emboss",
"RGB",
PROC_PLUG_IN,
nargs, nrets,
args, rets);
}
static void
run(gchar *name, gint nparam, GParam *param,
gint *nretvals, GParam **retvals)
{
static GParam rvals[1];
struct piArgs args;
GDrawable *drw;
*nretvals = 1;
*retvals = rvals;
memset(&args,(int)0,sizeof(struct piArgs));
rvals[0].type = PARAM_STATUS;
rvals[0].data.d_status = STATUS_SUCCESS;
switch (param[0].data.d_int32)
{
case RUN_INTERACTIVE:
gimp_get_data("plug_in_emboss", &args);
if (args.img == 0 && args.drw == 0)
{
/* initial conditions */
args.azimuth = 30.0;
args.elevation = 45.0;
args.depth = 20;
args.embossp = 1;
}
args.img = param[1].data.d_image;
args.drw = param[2].data.d_drawable;
drw = gimp_drawable_get(args.drw);
thePreview = mw_preview_build(drw);
if (pluginCoreIA(&args)==-1)
{
rvals[0].data.d_status = STATUS_EXECUTION_ERROR;
}
else
{
gimp_set_data("plug_in_emboss", &args, sizeof(struct piArgs));
}
break;
case RUN_NONINTERACTIVE:
if (nparam != 7)
{
rvals[0].data.d_status = STATUS_CALLING_ERROR;
break;
}
args.img = param[1].data.d_image;
args.drw = param[2].data.d_drawable;
args.azimuth = param[3].data.d_float;
args.elevation = param[4].data.d_float;
args.depth = param[5].data.d_int32;
args.embossp = param[6].data.d_int32;
if (pluginCore(&args)==-1)
{
rvals[0].data.d_status = STATUS_EXECUTION_ERROR;
break;
}
break;
case RUN_WITH_LAST_VALS:
gimp_get_data("plug_in_emboss", &args);
/* use this image and drawable, even with last args */
args.img = param[1].data.d_image;
args.drw = param[2].data.d_drawable;
if (pluginCore(&args)==-1) {
rvals[0].data.d_status = STATUS_EXECUTION_ERROR;
}
break;
}
}
#define pixelScale 255.9
static void
EmbossInit(gdouble azimuth, gdouble elevation, gushort width45) {
/*
* compute the light vector from the input parameters.
* normalize the length to pixelScale for fast shading calculation.
*/
Filter.Lx = cos(azimuth) * cos(elevation) * pixelScale;
Filter.Ly = sin(azimuth) * cos(elevation) * pixelScale;
Filter.Lz = sin(elevation) * pixelScale;
/*
* constant z component of image surface normal - this depends on the
* image slope we wish to associate with an angle of 45 degrees, which
* depends on the width of the filter used to produce the source image.
*/
Filter.Nz = (6 * 255) / width45;
Filter.Nz2 = Filter.Nz * Filter.Nz;
Filter.NzLz = Filter.Nz * Filter.Lz;
/* optimization for vertical normals: L.[0 0 1] */
Filter.bg = Filter.Lz;
}
/*
* ANSI C code from the article
* "Fast Embossing Effects on Raster Image Data"
* by John Schlag, jfs@kerner.com
* in "Graphics Gems IV", Academic Press, 1994
*
*
* Emboss - shade 24-bit pixels using a single distant light source.
* Normals are obtained by differentiating a monochrome 'bump' image.
* The unary case ('texture' == NULL) uses the shading result as output.
* The binary case multiples the optional 'texture' image by the shade.
* Images are in row major order with interleaved color components (rgbrgb...).
* E.g., component c of pixel x,y of 'dst' is dst[3*(y*xSize + x) + c].
*
*/
static inline void
EmbossRow(guchar *src, guchar *texture, guchar *dst,
guint xSize, guint bypp, gint alpha) {
glong Nx, Ny, NdotL;
guchar *s1, *s2, *s3;
gint x, shade, b;
gint bytes;
/* mung pixels, avoiding edge pixels */
s1 = src + bypp;
s2 = s1 + (xSize*bypp);
s3 = s2 + (xSize*bypp);
dst += bypp;
bytes = (alpha) ? bypp - 1 : bypp;
if (texture) texture += bypp;
for (x = 1; x < xSize-1; x++, s1+=bypp, s2+=bypp, s3+=bypp) {
/*
* compute the normal from the src map. the type of the
* expression before the cast is compiler dependent. in
* some cases the sum is unsigned, in others it is
* signed. ergo, cast to signed.
*/
Nx = (int)(s1[-(int)bypp] + s2[-(int)bypp] + s3[-(int)bypp]
- s1[bypp] - s2[bypp] - s3[bypp]);
Ny = (int)(s3[-(int)bypp] + s3[0] + s3[bypp] - s1[-(int)bypp]
- s1[0] - s1[bypp]);
/* shade with distant light source */
if ( Nx == 0 && Ny == 0 )
shade = Filter.bg;
else if ( (NdotL = Nx*Filter.Lx + Ny*Filter.Ly + Filter.NzLz) < 0 )
shade = 0;
else
shade = NdotL / sqrt(Nx*Nx + Ny*Ny + Filter.Nz2);
/* do something with the shading result */
if ( texture ) {
for(b=0;b<bytes;b++) {
*dst++ = (*texture++ * shade) >> 8;
}
if (alpha) {
*dst++=s2[bytes]; /* preserve the alpha */
texture++;
}
}
else {
for(b=0;b<bytes;b++) {
*dst++ = shade;
}
if (alpha) *dst++=s2[bytes]; /* preserve the alpha */
}
}
if (texture) texture += bypp;
}
int pluginCore(struct piArgs *argp) {
GDrawable *drw;
GPixelRgn src, dst;
gint p_update;
gint y;
guint width, height;
gint bypp, rowsize, has_alpha;
guchar *srcbuf, *dstbuf;
drw=gimp_drawable_get(argp->drw);
width=drw->width;
height=drw->height;
bypp=drw->bpp;
p_update = height/20;
rowsize = width * bypp;
has_alpha = gimp_drawable_has_alpha (argp->drw);
gimp_pixel_rgn_init (&src, drw, 0, 0, width, height, FALSE, FALSE);
gimp_pixel_rgn_init (&dst, drw, 0, 0, width, height, TRUE, TRUE);
srcbuf=(guchar*)malloc(rowsize*3);
dstbuf=(guchar*)malloc(rowsize);
memset(srcbuf,(int)0,(size_t)(rowsize*3));
memset(dstbuf,(int)0,(size_t)rowsize);
EmbossInit(DtoR(argp->azimuth), DtoR(argp->elevation), argp->depth);
gimp_progress_init("Emboss");
gimp_tile_cache_ntiles((width + gimp_tile_width() - 1) / gimp_tile_width());
/* first row */
gimp_pixel_rgn_get_rect(&src, srcbuf, 0, 0, width, 3);
memcpy(srcbuf, srcbuf+rowsize, rowsize);
EmbossRow(srcbuf, argp->embossp ? (guchar *)0 : srcbuf,
dstbuf, width, bypp, has_alpha);
gimp_pixel_rgn_set_row(&dst, dstbuf, 0, 0, width);
/* last row */
gimp_pixel_rgn_get_rect(&src, srcbuf, 0, height-3, width, 3);
memcpy(srcbuf+rowsize*2, srcbuf+rowsize, rowsize);
EmbossRow(srcbuf, argp->embossp ? (guchar *)0 : srcbuf,
dstbuf, width, bypp, has_alpha);
gimp_pixel_rgn_set_row(&dst, dstbuf, 0, height-1, width);
for(y=0 ;y<height-2; y++){
if (y%p_update==0) gimp_progress_update((gdouble)y/(gdouble)height);
gimp_pixel_rgn_get_rect(&src, srcbuf, 0, y, width, 3);
EmbossRow(srcbuf, argp->embossp ? (guchar *)0 : srcbuf,
dstbuf, width, bypp, has_alpha);
gimp_pixel_rgn_set_row(&dst, dstbuf, 0, y+1, width);
}
free(srcbuf);
free(dstbuf);
gimp_drawable_flush(drw);
gimp_drawable_merge_shadow (drw->id, TRUE);
gimp_drawable_update(drw->id, 0, 0, width, height);
gimp_displays_flush();
return 0;
}
int pluginCoreIA(struct piArgs *argp) {
GtkWidget *dlg;
GtkWidget *hbox;
GtkWidget *table;
GtkWidget *preview;
GtkWidget *frame;
gint runp;
struct mwRadioGroup functions[] = {
{ "Emboss", 0 },
{ "Bumpmap", 0 },
{ NULL, 0 },
};
gchar **argv;
gint argc;
/* Set args */
argc = 1;
argv = g_new(gchar *, 1);
argv[0] = g_strdup("emboss");
gtk_init(&argc, &argv);
gtk_rc_parse(gimp_gtkrc ());
functions[!argp->embossp].var = 1;
dlg = mw_app_new("plug_in_emboss", "Emboss", &runp);
hbox = gtk_hbox_new(FALSE, 5);
gtk_container_border_width(GTK_CONTAINER(hbox), 5);
gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dlg)->vbox), hbox, TRUE, TRUE, 0);
gtk_widget_show(hbox);
preview = mw_preview_new(hbox, thePreview, &emboss_do_preview);
gtk_object_set_data(GTK_OBJECT(preview), "piArgs", argp);
gtk_object_set_data(GTK_OBJECT(preview), "mwRadioGroup", &functions);
emboss_do_preview(preview);
mw_radio_group_new(hbox, "Function", functions);
frame = gtk_frame_new("Parameters");
gtk_frame_set_shadow_type(GTK_FRAME(frame), GTK_SHADOW_ETCHED_IN);
gtk_container_border_width(GTK_CONTAINER(frame), 5);
gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dlg)->vbox), frame, TRUE, TRUE, 0);
gtk_widget_show(frame);
table = gtk_table_new(4, 2, FALSE);
gtk_container_border_width(GTK_CONTAINER (table), 5);
gtk_container_add(GTK_CONTAINER(frame), table);
mw_fscale_entry_new(table, "Azimuth", 0.0, 360.0, 1.0, 10.0, 0.0,
0, 1, 1, 2, &argp->azimuth);
mw_fscale_entry_new(table, "Elevation", 0.0, 180.0, 1.0, 10.0, 0.0,
0, 1, 2, 3, &argp->elevation);
mw_iscale_entry_new(table, "Depth", 1, 100, 1, 5, 0,
0, 1, 3, 4, &argp->depth);
gtk_widget_show(table);
gtk_widget_show(table);
gtk_widget_show(dlg);
gtk_main();
gdk_flush();
argp->embossp = !mw_radio_result(functions);
if(runp){
return pluginCore(argp);
} else {
return -1;
}
}
static void
emboss_do_preview(GtkWidget *w) {
static GtkWidget *theWidget = NULL;
struct piArgs *ap;
struct mwRadioGroup *rgp;
guchar *dst, *c;
gint y, rowsize;
if(theWidget==NULL){
theWidget=w;
}
ap = gtk_object_get_data(GTK_OBJECT(theWidget), "piArgs");
rgp = gtk_object_get_data(GTK_OBJECT(theWidget), "mwRadioGroup");
ap->embossp = !mw_radio_result(rgp);
rowsize=thePreview->width*thePreview->bpp;
dst = malloc(rowsize);
c = malloc(rowsize*3);
memcpy(c, thePreview->bits, rowsize);
memcpy(c+rowsize, thePreview->bits, rowsize*2);
EmbossInit(DtoR(ap->azimuth), DtoR(ap->elevation), ap->depth);
EmbossRow(c, ap->embossp ? (guchar *)0 : c,
dst, thePreview->width, thePreview->bpp, FALSE);
gtk_preview_draw_row(GTK_PREVIEW(theWidget),
dst, 0, 0, thePreview->width);
memcpy(c, thePreview->bits+((thePreview->height-2)*rowsize), rowsize*2);
memcpy(c+(rowsize*2), thePreview->bits+((thePreview->height-1)*rowsize),
rowsize);
EmbossRow(c, ap->embossp ? (guchar *)0 : c,
dst, thePreview->width, thePreview->bpp, FALSE);
gtk_preview_draw_row(GTK_PREVIEW(theWidget),
dst, 0, thePreview->height-1, thePreview->width);
free(c);
for(y=0, c=thePreview->bits;y<thePreview->height-2; y++, c+=rowsize){
EmbossRow(c, ap->embossp ? (guchar *)0 : c,
dst, thePreview->width, thePreview->bpp, FALSE);
gtk_preview_draw_row(GTK_PREVIEW(theWidget),
dst, 0, y, thePreview->width);
}
gtk_widget_draw(theWidget, NULL);
gdk_flush();
free(dst);
}
/*
* Local Variables:
* mode: C
* c-indent-level: 2
*
* End:
*/
/* end of file: emboss/emboss.c */
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